.backtotop {
  position: fixed;
  bottom: 80px;
  right: 80px;
  width: 80px;
  height: 80px;
  background-color: #ccc;
  font-size: 20px;
  text-align: center;
  padding-top: 12px;
  box-sizing: border-box;
  color: #000;
  display: none;
}
